Water-tube boiler



Jan. 5 1926. 1,568,555

l. HARTER, JR

"WATER'TUBE BOILER Original FiledMayZQ, 1918 2 Sheets-Sheet l INVENoR.v

Patented Jan. 1926.`

ISAAC HAR/IER, JB, OF DONGAN I-IIIIZIS,` NEW YORK, ASSIGNOR 'ro THE BABcocK a WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A COItPOB/ATION NEW JERSEY WATER-TUBE BOILER.

- Application filediuayv 29, 191s, Serial 110.237,234. Renewed December 31', 192s.- serial No. 594,201.

To a?? rho-m. it 'may concern Bc it known that I, ISAAC I-IAn'rnR, Jr., acitizen of the United States, residing at Dongan Hills, in the county of Itichinond, State of New York, have invented a new and useful Improvement in' Vater-Tube Boilers, of which the following is a full, clear, and exact description, 'referencejbeing had to the-accompanying drawing, forming part of this specification.

My invention relates to boilers of the general Babcock & vWilcox type, wherein i 'other deposits-to collect on vthe tubes, and toy some extent" block up the passageway for horizontally inclined tubes are connected to downtake and uptake headers, which, in

turn, are connected to a steamxand water.

drum ondrums. In certain classes of'such bollers, there 1s a tendency for slag and the entry of the gases to and over the tubes. My invention is designedv to reduce or overcome this d ifliculty by aspecial arranges the passes among ment of the lowermost rows of .water tubes.

Referring now to the drawings, in which I Show the preferred form of my invention, Figure 1 .is a sectional side,elevation showing one type of lBabcock & Wilcox boiler, arrange-fl lin accor/dancewith my invention; Fig.' 2 is a cross sectionof the water tubes on the vline II-II of Fig. 1 Fig. 3 is an enlarged Sectional side elevation 4of a boiler 'i similar to that shown in Fig. 1, but showing a'modication," in which the lowermost rows vof tubesare of Vsmaller diameter, andl Figi 4 is a 4view similar to Fig. 2, but' takenv asa cross-section on the modification shown in Fig...3. v f

In'Figs. 1 and 2\of the drawings, 2 represents bank of horizontally inclined tubes having their ends connected to lower headersf3 and upper headers 4. These headers are provided with drop-leg portions .5 and 6, into which connect two lower rows of tubes 7 and 8. The downtake headers are f connected to the steam and water drum 9 through -tubes 10, while the upwardextensions of the uptake headersare connected to l" the steam 'and water drum through horif 'zontal water tubes 11. r

v I have Shown a furnace. chamber 12, extending substantially throughout the length of thelower tubes with double firing at both ends by underfeed stokersl 13 and 14. Overlying .the .PQW Qf' tubes 7 is. a horizontal bafffling 15, from the inner end of which eX- tends :.tvertical bathe 16. 17 isa further b aileextending through the main bank and provided with abaiile extension 18. The gases from the furnace rise through the right--llant'l pass-However the superheater 1'9, if such is used,`then descend through the middle pass between the baffles 16 and 17, and then rise throughthe third passto the outlet flue 20.

In the form `of my invention illustrated in Figs. 1 and. 2, the lowermost rowsof ,tubes 7 and 8 are arranged so that the tubes of the row 7 are directlyover the corre@ spending tubes of the row 8, as best shown vin Fig. 2, while the tubes of the main bank 2 are staggered in successive rows, as also shownv 1n F1g.-2. Furthermore,

the tubes 7 i and 8 are'more widely spaced vertically than are lthe -tubes of the main bank v2.

Inthe formillustrated in Figs. 3 and 4,

.fthe tubes 7 l and' 8a are of smaller diameter results in the flow area through each of the rows of tubes .7a and 8 being greater per unit of length of pass measured 'along or longitudinally ofthe'tubes than in the main,

bank 2a. The tubes 785 and 8a are also more .widely spaced vertically than. areI the tubes inthe main bank 2a,.- 1

'In this type of boiler,'whe`n used with ak firingapparatus, such as an underfeed Stoker, which causes. slag particles to rise with the gases, slag is liableto be deposited onv the lower boiler tubes and closeup the flow passages.

"The arrangements illustrated '.will minimize the deposition of slag on the tubes and, moreover,will minimize the harmful effects of such depositionL-'By.increasing 'the distance from the wall of a tube inthe lowermost row to the nearest wall of a tube in the next row, a molten slag particle has a longer time to cool afterpassing the tubesin the first row before striking the wall of a tube in gradually the next higher row, which time is further particles, their tendency to stick tothe tubes is decreased Moreover, if slag idoes accumulate on' the-row ahov5 the IQWQrmQSt row,l the greater distance between the walls of the tubes in "that row and the lowermost row permits a greater accumulation before the gas passages will be obstructed and, therefore, a longer time Ibefore the' exteriors of the tubes must be cleaned.

' The' advantages of my invention will be obvious tothose skilled in the art, sincethe tendency to clog up the free entrance otthe gas in the lowerl part of the -irst vertical pass is reduced or avoided, and better eiici-f encyis obtained.-v The number of the lowen lrows of tubes which are specially arranged to prevent slaggi'ng may be varied, the fir-y ing means may be of any suitable type, the superheater may or may not be used, and many' other changes may be made without departing from my invention.

. What I claim and desire to'secure by Letters Patent of the United States is 1. The combination lwith a water-tube boiler having a main bankV of horizontally extending inclined watertubes connecting water compartments at the,fro`nt and rear,

-the rows of water tubes'in said bank being staggered relatively to each other, of a plurality of rows ofwater tubes .below said bank and exposed to the radiant heat lof the fui'- nace vfor the major portion Iof their length,

the tubes in the lowermost row being placed under the corresponding tubes of the next row -above them, .a roof baffle extending longitudinally of the water tubes above the Y lower water tubes and having at its inner end prtion an upwardly extending baiieV arranged togive'the gases an upward translverse pass across the water tubesof the main bank, the spacing, diameters and arrangement of the tubes being such as to give less resistance to the iow of thegases per unit of length of pass along the tubes inpassing from ,the furnace to above -the lowermost lines of tubes than the resistance to the How of the gases in the first upward pass among ,l thel tubes of the main bank, `whereby slagging of the lower water tubes 1s reduced, and

a furnace below the lower superposed water tubes havingi'iring apparatus ofthe type which causes slag particles to rise with the gases entering the water tubes.

2.y The combination with a v water-tubev boiler having al main bank of horizontally extending inclined water tubes connecting water compartments .at the-front and rear, the rowsy of water tubes in said'bankbeing v staggered relatively to each other, of a plus rality of rows of water tubes below said bank and exposed to the radiant heat of the furnace for the major portion of their length, the tubes in the lowermost row being lplaced under the corresponding tubes of the next row above them, a roof'bale extending longitudinally of' the water tubes above the lower water tubes and havingat its inner end portion an upwardly extendmg baie arranged to give the gases an upward*A transverse pass across'the water tubes of the less resistance to the flow of the gases per unit of length of pass along the tubes .in

flow of the gases inthe first upward pass .among the tubes of the main bank, whereby slagging of the lower water tubes is reduced, and a furnace below the` lower superposed water tubes having double-firing mechanism comprising undert'eed Stokers projecting inwardly from the opposite front and rear` ends of the furnace.

Vmain bank, the spacing, diameters and arp rangement-of the tubes being such as .to give ,4 passing from the furnace to above the lower- `most lines of tubes than the resistance tothe 3. rlhe combination vwith awater-tube boiler" having a main bankA ofhorizontally j i `extending inclined water tubesjlconnecting water compartmentsat thefront and rear, ithe rows of water tubes in said bank being staggered relatively toeach other, of a plurality of rows of Water ,tubes below said bank and exposedto thexradia'nt heat of the furnace for the major portion of their length, the tubes in the lowermost row being placed under the corresponding tubes of thek next row above them," a roof baiile` extending llongitudinally of the water tubes kabove the lower water tubes `and having'at its inner end portion an upwardly extending balle arranged to give the gases an upward trans verse pass across the water tubes of the main bank, the spacing, diameters and arrangement of the tubes being such as to give less. resistance to'the flow of'the gasesvper umt of length of pass-along the tubes in passing e ifrom the furnace to above the lowermost lines of tubes than the resistance to the How of the gases inthe first upward pass among lthe tubes of the main bank, whereby slag-V ging of thelower water tubes is reduced, land a furnace extending underneath the lower superposed tubes for substantially their length and having mechanical stokers prothe gases across the tubes, the 'distance be-`l` tween the wall of a tube of the lowermost row and the wall of the nearest tube in the next higher row being greater than the distance between the wall of a tube in the main bank andthe wall of any tube in the next higher row of the main bank, and a furnace having firing apparatus of the type which causes slag particles to rise with the gases entering the water tubes.

l 1,568,1scszsf i, 5. ,The combination with a water tube 1 extending inclined water tubesconnecting' .g

Cil

boiler having a. main bank of horizontally water compartments at the vfront and rear,

the rows-of water-tubes in said bankfbeing staggered relativelyr to each other,^ of al plurality of rows of water tubes below' said bank, baiiing to give transverse passes for the gases across the tubes, the distance-bee y tance betwen the wally tween'the wall of a. tube ofthe lowermost row andthe wall of the nearest tube in the next higher row beingv eater than the disl u ora tube in the main bank and the-wall of any tube in the next higher row of the main bank, vand 'the sp'acyf ing, diameters and arrangement yof said' lower rows of tubes being such as to give le'resistanceto the flowofthe gases per unit of lengthof -pass alon the tubes in passing from the furnace to a ve the lowermost rows of tubes than the resistance to flow of gases inthe first upward pass among the' tubes of the main bank, whereby slaggingfof the lower watertubes is reduced,

and a furnace having firing apparatus ofthe y' tvpe which causes'slag particlestorise with tance between walls of adjacent tubes in the `lowermost row being greater than the horizontal distance between walls of tubes inthe rows in the main' bank, whereby a greaterl as flow areaper-unit length of pass along 1 the tubes and a correspondin decrease 1n velocity `ofthe gases is provlded through said lowermost row than through the rows of the main bank, whereby slagging of, the lower water tubes is reduced, and a furnace havingvring` apparatus of the type vwhich causesfslag particlesto rise with thevgases entering (the water utubes.

7: The comblnatlon with a water tube boiler having a main bank of horizontally extending inclined water tubes' connecting water compartments vat the front and-rear, the rows of water ytubes insaid bank being vstaggered relatively to each other, ofa plurality of rows of water 'tubes below said bank', the outside diameters `of said tubesJ u being'diiferent from the outside diameters Aof the tubes in the main bank baling to give transverse passes for the gases across the tubes, the spacing, diameters andjarrangement of the lower tubes being such as to give less resistance to \the flow ofthe gasesper junit length of pass along the tubes in passing from the furnace to above the lowermost rows oftubes than the resistance to flow of` the gases in the iirst upward pass among the tubes of the-main bank, whereby slagging ofthe lower water tubes is reduced, and a furnace having firing apparatus of the ty e which causes slag particlesto rise Awith t e gases entering the water tubes.r

In'testimony whereof I have hereunto signed ny name. Y f

Isaac HARTER, JR, e 

